on my site (link see below) I have the following problem:
I have a banner at the top of the screen. When scrolling, it disappears in the background and is overlaid by the main menu.
However, the bigger dilemma is: on the mobile device, when I unfold the menu, it disappears as soon as I scroll. So the menu doesn’t stay open when I scroll down the website but closes on its own. This makes it impossible to click on some items in the main menu.
Maybe you can open the page once on your smartphone, then you will see it immediately.
I’ve had this problem before on another site. I don’t remember how I had solved it, though.